|
PatentVote.com: Vote on your favourite invention!
|
|
 |
Title: Fail-safe reference voltage source
Abstract:
This disclosure relates to a vital type of d.c. reference voltage supply. The reference voltage supply is coupled to a suitable source of a.c. voltage. A zener diode rectifies the a.c. voltages and regulates the rectified d.c. voltage. A current-limiting resistor is connected from the zener diode to a four-terminal capacitor which charges to a value approximately equal to the zener breakdown voltage minus the diode voltage drop. Hence, a constant d.c. reference voltage is produced when and only when no critical component or circuit failure is present.
Other info: Inventors: Campbell, Richard D. (Harmarville, PA, US) Application Number: 417113 Filing Date: 1973-11-19 Publication_date: 1976-04-13 Assignee: Westinghouse Air Brake Company (Swissvale, PA) Primary Class(es): 363/126 361/434 Other Classes: US Patent Ref:
Other Refs:
| |